CN117342834B - Machine-made sand concrete with high workability and preparation method thereof - Google Patents
Machine-made sand concrete with high workability and preparation method thereof Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 104
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 40
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical class O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000008367 deionised water Substances 0.000 claims abstract description 28
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 22
- 229920002907 Guar gum Polymers 0.000 claims abstract description 21
- 239000000665 guar gum Substances 0.000 claims abstract description 21
- 229960002154 guar gum Drugs 0.000 claims abstract description 21
- 235000010417 guar gum Nutrition 0.000 claims abstract description 21
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 20
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 17
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims abstract description 15
- -1 4-hydroxybutyl vinyl Chemical group 0.000 claims abstract description 13
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 13
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 13
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims abstract description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 230000005484 gravity Effects 0.000 claims description 40
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 27
- 239000012286 potassium permanganate Substances 0.000 claims description 25
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 claims description 17
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 16
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 16
- 238000012986 modification Methods 0.000 claims description 15
- 230000004048 modification Effects 0.000 claims description 15
- 229920000858 Cyclodextrin Polymers 0.000 claims description 11
- 239000001116 FEMA 4028 Substances 0.000 claims description 11
- 235000011175 beta-cyclodextrine Nutrition 0.000 claims description 11
- 229960004853 betadex Drugs 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 11
- 239000004575 stone Substances 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000002518 antifoaming agent Substances 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 10
- QWXYZCJEXYQNEI-OSZHWHEXSA-N intermediate I Chemical compound COC(=O)[C@@]1(C=O)[C@H]2CC=[N+](C\C2=C\C)CCc2c1[nH]c1ccccc21 QWXYZCJEXYQNEI-OSZHWHEXSA-N 0.000 claims description 10
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 10
- 235000011152 sodium sulphate Nutrition 0.000 claims description 10
- 238000000498 ball milling Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000005204 segregation Methods 0.000 description 14
- 238000011056 performance test Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 3
- 239000011083 cement mortar Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- HMBNQNDUEFFFNZ-UHFFFAOYSA-N 4-ethenoxybutan-1-ol Chemical compound OCCCCOC=C HMBNQNDUEFFFNZ-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides machine-made sand concrete with high workability and a preparation method thereof, belonging to the technical field of concrete; the preparation process comprises the following steps: adding thiourea to react to prepare a component A; adding sulfamic acid to prepare modified cyclodextrin; adding modified cyclodextrin to prepare a component B; add component a, component B and guar gum and mix thoroughly. According to the invention, after 4-hydroxybutyl vinyl polyoxyethylene ether, thiourea and deionized water are stirred and mixed, methacrylic acid, acrylamide, 2-methacrylamide-2-methylisopropyl sulfonic acid and deionized water are added to prepare the component A through a reaction of a premix solution prepared by mixing the components A and deionized water, and a large amount of small bubbles can be introduced in the process of stirring concrete, so that the flow rate of the concrete is increased, and the workability of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to machine-made sand concrete with high workability and a preparation method thereof.
Background
The machine-made sand concrete is prepared by replacing natural river sand with machine-made sand, wherein the machine-made sand is prepared by combining a broken stone production line with a machine-made sand machine, crushing, collecting and screening the rock to prepare artificial sand with the grain diameter smaller than five millimeters and reasonable grading and the mud content meeting the construction requirements, and compared with the natural river sand, the machine-made sand has sharp edges and corners, coarse grains and larger mechanical biting force, and the prepared concrete has higher strength.
However, the existing machine-made sand concrete has the problems of poor fluidity, poor water retention, easy segregation and bleeding and the like and has the problems of sensitivity to water consumption, large slump fluctuation, difficult control of fluidity and the like because the prepared machine-made sand concrete has high viscosity due to high mud content.
Therefore, we propose a machine-made sand concrete with easy control of fluidity and high workability and a preparation method thereof to improve the workability of the machine-made sand concrete.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide machine-made sand concrete with high workability and a preparation method thereof.
A preparation method of machine-made sand concrete with high workability comprises the following steps:
s1: adding thiourea to react to prepare the component A
Mixing methacrylic acid, acrylamide, deionized water and 2-methacrylamide-2-methylene isopropyl sulfonic acid to prepare a premix, fully mixing 4-hydroxybutyl vinyl polyoxyethylene ether and deionized water, adding thiourea, stirring and mixing, and simultaneously adding the premix and a potassium permanganate solution for reaction to obtain a component A;
s2: preparation of modified cyclodextrin by adding sulfamic acid
The beta-cyclodextrin, sulfamic acid and N, N-dimethylformamide are dispersed and mixed at high speed, then the mixture reacts under the irradiation of microwaves, and then sodium hydroxide solution is added to adjust the pH value, so as to obtain modified cyclodextrin;
s3: adding modified cyclodextrin to prepare component B
Stirring and mixing polyvinyl alcohol, anhydrous sodium sulfate and the modified cyclodextrin, adding a defoaming agent, and continuously stirring and mixing uniformly to obtain a component B;
s4: adding component A, component B and guar gum, and mixing thoroughly
And (3) fully stirring and mixing cement, fly ash, modified machine-made sand and crushed stone, adding a water reducing agent and water, stirring and mixing, and mixing the component A, the component B and guar gum to obtain the machine-made sand concrete.
Further, the thiourea is added in the step S1 to react and prepare the component A, and the method specifically comprises the following steps:
s1.1: adding methacrylic acid, acrylamide and deionized water into a mixing tank according to the mass ratio of 10-12:3-4:6-8, fully stirring and mixing, then adding 2-methacrylamide-2-methyleneisopropyl sulfonic acid, and continuously stirring and mixing to obtain a premix for later use;
s1.2: fully dissolving and mixing potassium permanganate and deionized water according to a solid-to-liquid ratio of 1g to 20-30mL to obtain a potassium permanganate solution for later use;
s1.3: adding 4-hydroxybutyl vinyl polyoxyethylene ether and deionized water into a reactor according to a mass ratio of 4-6:1, stirring for 20-30min at a speed of 300-400r/min by using a stirrer, and fully dissolving;
s1.4: adding thiourea into the reactor, regulating the stirring speed to 200-300r/min by a stirrer, and continuously stirring for 30-40min;
s1.5: the stirring speed is kept unchanged, the premixed solution and the potassium permanganate solution are added into a reactor at a constant speed, the reaction is carried out while stirring, and the reaction is continued for 1-2h after the addition is completed;
s1.6: sodium hydroxide solution was added to the reactor until ph=7-8 was detected by a pH meter in the reactor, and the addition of sodium hydroxide solution was stopped to obtain component a.
Further, the step S2 of adding sulfamic acid to prepare modified cyclodextrin specifically comprises the following steps:
s2.1: adding beta-cyclodextrin, sulfamic acid and N, N-dimethylformamide together according to the mass ratio of 10-12:1:15-20 into a closed high-speed dispersing machine, stirring at a high speed of 2800-3000r/min for 20-30min, and uniformly dispersing to obtain an intermediate I;
s2.2: placing the intermediate I in a microwave reactor, irradiating for 6-10min with 200-300W power, and reacting to obtain an intermediate II;
s2.3: and adding sodium hydroxide solution into the intermediate II, stirring and dispersing until the pH value of the intermediate II is regulated to 6-7, and stopping adding the sodium hydroxide solution to obtain the modified cyclodextrin.
Further, the step S3 of adding modified cyclodextrin to prepare the component B specifically comprises the following steps:
s3.1: adding polyvinyl alcohol, anhydrous sodium sulfate and the modified cyclodextrin prepared in the step S2.3 into a stirrer together according to the mass ratio of 3-5:2-4:3-4 until a second gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more, and sending a signal to a controller by the second gravity sensor;
s3.2: after the controller receives the signal sent by the second gravity sensor, the stirrer is controlled to stir for 1-2h at the speed of 300-500 r/min;
s3.3: the controller controls the feeding component to add the defoaming agent into the stirrer according to 25-35% of the mass of the polyvinyl alcohol until the second gravity sensor detects that the gravity in the stirrer is not increased again, and the second gravity sensor sends a signal to the controller again;
s3.4: and after the controller receives the signal sent by the second gravity sensor again, controlling the stirrer to stir at the speed of 800-1000r/min for 40-50min to obtain the component B.
Further, the step S4 of adding the component A, the component B and the guar gum and fully mixing comprises the following steps:
s4.1: adding cement, fly ash, modified machine-made sand and crushed stone into a concrete mixer, starting the concrete mixer, stirring for 20-30min, and fully dispersing and mixing;
s4.2: adding the water reducer and water into a concrete mixer, continuously stirring for 10-20min, and fully mixing to obtain a component C;
s4.3: adding the component B and guar gum prepared in the step S3.4 into a concrete mixer, and fully mixing with the component C;
s4.4: and (3) adding the component A prepared in the step (S1.7) into a concrete mixer, and continuously stirring and mixing to obtain the machine-made sand concrete.
Further, before the machine-made sand is added to prepare the machine-made sand concrete, the machine-made sand is subjected to modification pretreatment: taking out all ball milling media in the ball mill, putting the machine-made sand in the ball mill, starting the ball mill, performing throwing motion on the machine-made sand in the ball mill, and performing mutual collision friction on the machine-made sand through the throwing motion to perform surface modification.
Further, the machine-made sand concrete comprises: 300-400 parts of cement, 200-300 parts of fly ash, 650-750 parts of machine-made sand, 500-600 parts of crushed stone, 20-30 parts of component A, 25-35 parts of component B, 12-18 parts of guar gum, 4-6 parts of water reducer and 160-200 parts of water.
Further, the mass ratio of the 2-methacrylamide-2-methyleneisopropyl sulfonic acid to the methacrylic acid is 2-3:1.
Further, the mass ratio of the 4-hydroxybutyl vinyl polyoxyethylene ether to the thiourea to the premix solution to the potassium permanganate solution is 1:2-3:5-7:3-5.
A high-workability machine-made sand concrete prepared by the method for preparing the high-workability machine-made sand concrete.
Compared with the prior art, the invention has at least the following beneficial effects:
1. according to the invention, after 4-hydroxybutyl vinyl polyoxyethylene ether, thiourea and deionized water are stirred and mixed, methacrylic acid, acrylamide, 2-methacrylamide-2-methylisopropyl sulfonic acid and deionized water are added to prepare the component A through a reaction of a premix solution prepared by mixing the components A and deionized water, and a large amount of small bubbles can be introduced in the process of stirring concrete, so that the flow rate of the concrete is increased, and the workability of the concrete is improved.
2. According to the invention, the component B is prepared by stirring and mixing polyvinyl alcohol, anhydrous sodium sulfate, modified beta-cyclodextrin and a defoaming agent, and is added into machine-made sand concrete, so that the slump of the concrete can be reduced, the bleeding segregation phenomenon of the concrete is improved, and the workability of the concrete is improved.
3. According to the invention, after the beta-cyclodextrin, the sulfamic acid and the N, N-dimethylformamide are dispersed and mixed at a high speed, the modified beta-cyclodextrin can replace the effect of a part of water reducer and can also improve the workability and cohesiveness of concrete, and in addition, the component B obtained by compounding the modified beta-cyclodextrin with the polyvinyl alcohol, the anhydrous sodium sulfate and the defoamer can also replace the effect of a part of water reducer, so that the effect of saving the water reducer is achieved.
4. According to the invention, before the machine-made sand is added, the machine-made sand is firstly added into the ball mill after the ball milling medium is taken out, so that the machine-made sand is mutually collided and rubbed, the surface modification is carried out, the grain shape of the machine-made sand can be improved, and the fluidity and cohesiveness of the machine-made sand concrete are improved, so that the workability of the machine-made sand concrete is further improved.
5. According to the invention, through adding guar gum, the water retention, suspension and wrapping property of the machine-made sand concrete can be improved, the segregation rate is reduced, and the guar gum can cooperate with the action of the component B, so that the workability of the machine-made sand concrete is further improved.
Drawings
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the disclosure and to enable a person skilled in the pertinent art to make and use the disclosure.
FIG. 1 is a flow chart of a method for preparing high workability machine-made sand concrete used in the examples of the present invention;
FIG. 2 is a summary of the performance test results of examples 1-3 and comparative examples 1-4 of the present invention.
Description of the embodiments
The machine-made sand concrete with high workability and the preparation method thereof provided by the invention are described in detail below with reference to the accompanying drawings and specific examples.
Example 1, a method for preparing machine-made sand concrete with high workability, as shown in fig. 1 and 2, comprises the following steps:
s1: adding thiourea to react to prepare the component A
Firstly, adding methacrylic acid, acrylamide and deionized water into a mixing tank according to a mass ratio of 10:3:6, fully stirring and mixing, then adding 2-methacrylamide-2-methyleneisopropylsulfonic acid into the mixing tank, wherein the mass ratio of 2-methacrylamide-2-methyleneisopropylsulfonic acid to methacrylic acid is 2:1, continuously stirring and mixing to obtain a premix solution, secondly, fully dissolving and mixing potassium permanganate and deionized water according to a solid-to-liquid ratio of 1g:20mL to obtain a potassium permanganate solution for standby, adding 4-hydroxybutyl vinyl polyoxyethylene ether and deionized water into a reactor according to a mass ratio of 4:1, stirring for 20min at a speed of 300r/min by using a stirrer, then adding thiourea into the reactor, simultaneously adjusting the stirring speed of the stirrer to be 200r/min, continuously stirring for 30min, simultaneously adding the premix solution and the potassium permanganate solution into the reactor at a uniform speed for reaction, continuously reacting for 1h after the addition of the premix solution and the potassium permanganate solution is completed, and detecting the mixture until the mass ratio of 4-hydroxybutyl vinyl ether and the potassium permanganate solution and the deionized water is the pH value of 3:7, and finally, adding the mixture into the sodium hydroxide solution into the reactor to the pH value of the reactor until the pH value of the mixture is detected to be 7;
s2: preparation of modified cyclodextrin by adding sulfamic acid
Adding beta-cyclodextrin, sulfamic acid and N, N-dimethylformamide together according to a mass ratio of 10:1:15 into a closed high-speed dispersing machine, stirring at a high speed of 2800r/min for 20min, uniformly dispersing to obtain an intermediate I, then placing the intermediate I into a microwave reactor, irradiating with microwaves for 6min at a power of 200W, reacting to obtain an intermediate II, adding a sodium hydroxide solution into the intermediate II, stirring and dispersing until the pH value of the intermediate II is regulated to 6, and stopping adding the sodium hydroxide solution to obtain the modified cyclodextrin;
s3: adding modified cyclodextrin to prepare component B
Adding polyvinyl alcohol, anhydrous sodium sulfate and the modified cyclodextrin into a stirrer together according to a mass ratio of 3:2:3, until a second gravity sensor in the stirrer detects that the gravity in the stirrer is no longer increased, sending a signal to a controller by the second gravity sensor, after receiving the signal sent by the second gravity sensor, controlling the stirrer to stir at a speed of 300r/min for 1h, then controlling a feeding component to add an antifoaming agent into the stirrer according to 25% of the mass of the polyvinyl alcohol by the controller, until the second gravity sensor detects that the gravity in the stirrer is no longer increased again, sending a signal to the controller again by the second gravity sensor, and controlling the stirrer to stir at a speed of 800r/min for 40min after receiving the signal sent by the second gravity sensor again, so as to obtain a component B;
s4: adding component A, component B and guar gum, and mixing thoroughly
Taking out all ball milling media in a ball mill, putting machine-made sand into the ball mill, starting the ball mill, performing throwing movement on the machine-made sand in the ball mill, performing mutual collision friction on the machine-made sand through the throwing movement, performing surface modification, adding 300 parts of cement, 200 parts of fly ash, 650 parts of machine-made sand subjected to surface modification and 500 parts of crushed stone into a concrete mixer, starting the concrete mixer, stirring for 20min, fully dispersing and mixing, adding 4 parts of water reducer and 160 parts of water into the concrete mixer, continuously stirring for 10min, fully mixing to obtain a component C, then adding 25 parts of the component B and 12 parts of guar gum into the concrete mixer, fully stirring and mixing with the component C, and finally, adding 20 parts of the component A into the concrete mixer, and continuously stirring and mixing to obtain the machine-made sand concrete.
Performance test:
firstly, the fluidity of the prepared machine-made sand concrete is tested by referring to GB\T2419-2005 cement mortar fluidity measuring method, and the result shows that the initial fluidity is about 314mm and the 1h fluidity is about 261mm;
then, slump, expansion and segregation ratio of the prepared machine-made sand concrete were tested with reference to GB/T50080-2016 Standard for test method of mixing Property of concrete, and the results showed that the initial slump was about 399 mm, the 1h slump was about 228mm, the expansion was about 587mm, the 1h expansion was about 569mm, and the segregation ratio was about 3.6%.
Example 2, a method for preparing machine-made sand concrete with high workability, as shown in fig. 1 and 2, comprises the following steps:
s1: adding thiourea to react to prepare the component A
Firstly, adding methacrylic acid, acrylamide and deionized water into a mixing tank according to a mass ratio of 11:3.5:7, fully stirring and mixing, then adding 2-methacrylamide-2-methyleneisopropylsulfonic acid, wherein the mass ratio of 2-methacrylamide-2-methyleneisopropylsulfonic acid to methacrylic acid is 2.5:1, continuously stirring and mixing to obtain a premix solution for standby, secondly, fully dissolving and mixing potassium permanganate and deionized water according to a solid-to-liquid ratio of 1g to 25mL to obtain a potassium permanganate solution for standby, adding 4-hydroxybutyl vinyl polyoxyethylene ether and deionized water into a reactor according to a mass ratio of 5:1, stirring for 25min at a speed of 350r/min by using a stirrer, fully dissolving, then adding thiourea into the reactor, simultaneously adjusting the stirring speed of the stirrer to be 250r/min, continuously stirring for 35min, simultaneously adding the premix solution and the potassium permanganate solution into the reactor at a constant speed, continuously reacting for 1.5h while stirring, detecting the mixture, and adding 4-hydroxybutyl vinyl ether and the potassium permanganate solution into the pH value of the reactor to be 1:5=6, and detecting the mixture to obtain a pH value of sodium hydroxide solution when the mixture is detected to be added into the reactor to be pH value of the reactor to be 6=7;
s2: preparation of modified cyclodextrin by adding sulfamic acid
Adding beta-cyclodextrin, sulfamic acid and N, N-dimethylformamide together according to a mass ratio of 11:1:17.5 into a closed high-speed dispersing machine, stirring at a high speed of 2900r/min for 25min, uniformly dispersing to obtain an intermediate I, then placing the intermediate I into a microwave reactor, irradiating with microwaves for 8min at a power of 250W, reacting to obtain an intermediate II, adding a sodium hydroxide solution into the intermediate II, stirring and dispersing until the pH value of the intermediate II is regulated to 6.5, and stopping adding the sodium hydroxide solution to obtain the modified cyclodextrin;
s3: adding modified cyclodextrin to prepare component B
Adding polyvinyl alcohol, anhydrous sodium sulfate and the modified cyclodextrin into a stirrer together according to the mass ratio of 4:3:3.5, until a second gravity sensor in the stirrer detects that the gravity in the stirrer is no longer increased, sending a signal to a controller by the second gravity sensor, after receiving the signal sent by the second gravity sensor, controlling the stirrer to stir at the speed of 400r/min for 1.5h, then controlling a feeding component to add an antifoaming agent into the stirrer according to 30% of the mass of the polyvinyl alcohol by the controller, until the second gravity sensor detects that the gravity in the stirrer is no longer increased again, sending a signal to the controller again by the second gravity sensor, and controlling the stirrer to stir at the speed of 900r/min for 45min after receiving the signal sent by the second gravity sensor again, so as to obtain a component B;
s4: adding component A, component B and guar gum, and mixing thoroughly
Taking out all ball milling media in a ball mill, putting machine-made sand into the ball mill, starting the ball mill, performing throwing movement on the machine-made sand in the ball mill, performing mutual collision friction on the machine-made sand through the throwing movement, performing surface modification, adding 350 parts of cement, 250 parts of fly ash, 700 parts of machine-made sand subjected to surface modification and 550 parts of broken stone into a concrete mixer, starting the concrete mixer, stirring for 25min, fully dispersing and mixing, adding 5 parts of water reducer and 180 parts of water into the concrete mixer, continuously stirring for 15min, fully mixing to obtain a component C, adding 30 parts of the component B and 15 parts of guar gum into the concrete mixer, fully stirring and mixing with the component C, and finally, adding 25 parts of the component A into the concrete mixer, and continuously stirring and mixing to obtain machine-made sand concrete.
Performance test:
firstly, the fluidity of the prepared machine-made sand concrete is tested by referring to GB\T2419-2005 cement mortar fluidity measuring method, and the result shows that the initial fluidity is about 318mm and the 1h fluidity is about 262mm;
then, slump, expansion and segregation ratio of the prepared machine-made sand concrete were tested with reference to GB/T50080-2016 Standard for test method of mixing Property of concrete, and the results showed that the initial slump was about 242mm, the 1h slump was about 232mm, the expansion was about 594mm, the 1h expansion was about 572mm, and the segregation ratio was about 3.5%.
Example 3, a method for preparing machine-made sand concrete with high workability, as shown in fig. 1 and 2, comprises the following steps:
s1: adding thiourea to react to prepare the component A
Firstly, adding methacrylic acid, acrylamide and deionized water into a mixing tank according to a mass ratio of 12:4:8, fully stirring and mixing, then adding 2-methacrylamide-2-methyleneisopropyl sulfonic acid, wherein the mass ratio of 2-methacrylamide-2-methyleneisopropyl sulfonic acid to methacrylic acid is 3:1, continuously stirring and mixing to obtain a premix, secondly, fully dissolving and mixing potassium permanganate and deionized water according to a solid-to-liquid ratio of 1g:30mL to obtain a potassium permanganate solution for standby, adding 4-hydroxybutyl vinyl polyoxyethylene ether and deionized water into a reactor according to a mass ratio of 6:1, stirring for 30min at a speed of 400r/min by using a stirrer, fully dissolving, then adding thiourea into the reactor, simultaneously adjusting the stirring speed of the stirrer to 300r/min, continuously stirring for 40min, keeping the stirring speed unchanged, simultaneously adding the premix and the potassium permanganate solution into the reactor, continuously reacting for 2h while stirring, and finally adding the 4-hydroxybutyl vinyl polyoxyethylene ether, the potassium permanganate solution and the potassium permanganate solution into the reactor to a pH value of 3:8, detecting the pH value of the solution, and finally, adding the solution into the pH value of the solution to the reactor to be detected to be 3:8;
s2: preparation of modified cyclodextrin by adding sulfamic acid
Adding beta-cyclodextrin, sulfamic acid and N, N-dimethylformamide together according to a mass ratio of 12:1:20 into a closed high-speed dispersing machine, stirring at a high speed of 3000r/min for 30min, uniformly dispersing to obtain an intermediate I, then placing the intermediate I into a microwave reactor, irradiating with microwaves for 10min at a power of 300W, reacting to obtain an intermediate II, adding a sodium hydroxide solution into the intermediate II, stirring and dispersing until the pH value of the intermediate II is regulated to 7, and stopping adding the sodium hydroxide solution to obtain the modified cyclodextrin;
s3: adding modified cyclodextrin to prepare component B
Adding polyvinyl alcohol, anhydrous sodium sulfate and the modified cyclodextrin into a stirrer together according to a mass ratio of 5:4:4, until a second gravity sensor in the stirrer detects that the gravity in the stirrer is no longer increased, sending a signal to a controller by the second gravity sensor, after receiving the signal sent by the second gravity sensor, controlling the stirrer to stir at a speed of 500r/min for 2h, then controlling a feeding component to add an antifoaming agent into the stirrer according to 35% of the mass of the polyvinyl alcohol by the controller, until the second gravity sensor detects that the gravity in the stirrer is no longer increased again, sending a signal to the controller again by the second gravity sensor, and controlling the stirrer to stir at a speed of 1000r/min for 50min after receiving the signal sent by the second gravity sensor again, so as to obtain a component B;
s4: adding component A, component B and guar gum, and mixing thoroughly
Taking out all ball milling media in a ball mill, putting machine-made sand into the ball mill, starting the ball mill, performing throwing movement on the machine-made sand in the ball mill, performing mutual collision friction on the machine-made sand through the throwing movement, performing surface modification, adding 400 parts of cement, 300 parts of fly ash, 750 parts of machine-made sand subjected to surface modification and 600 parts of broken stone into a concrete mixer, starting the concrete mixer, stirring for 30min, fully dispersing and mixing, adding 6 parts of water reducer and 200 parts of water into the concrete mixer, continuously stirring for 20min, fully mixing to obtain a component C, then adding 35 parts of the component B and 18 parts of guar gum into the concrete mixer, fully stirring and mixing with the component C, and finally, adding 30 parts of the component A into the concrete mixer, and continuously stirring and mixing to obtain machine-made sand concrete.
Performance test:
firstly, the fluidity of the prepared machine-made sand concrete is tested by referring to GB\T2419-2005 cement mortar fluidity measuring method, and the result shows that the initial fluidity is about 315mm and the 1h fluidity is about 264mm;
then, slump and expansion degree of the produced machine-made sand concrete were tested with reference to GB/T50080-2016 Standard for test method of concrete mix properties, which shows that the initial slump was about 243mm, the 1h slump was about 230mm, the expansion degree was about 598mm, the 1h expansion degree was about 573mm, and the segregation rate of the machine-made sand concrete was observed to be about 3.6%.
Comparative example 1, according to the formula: 300 parts of cement, 200 parts of fly ash, 650 parts of machine-made sand, 500 parts of crushed stone, 4 parts of water reducer and 160 parts of water are prepared into machine-made sand concrete, and then performance test is performed with reference to the performance test method of example 1, as shown in fig. 2, and the results show that: the initial fluidity was about 260mm, the 1h fluidity was about 175mm, the initial slump was about 145mm, the 1h slump was about 114mm, the expansion was about 463mm, the 1h expansion was about 412mm, and the segregation rate was about 38.4%.
Comparing the performance test results of the above example 1, it is known that, after stirring and mixing 4-hydroxybutyl vinyl polyoxyethylene ether, thiourea and deionized water, adding methacrylic acid, acrylamide, 2-methylacrylamide-2-methyleneisopropyl sulfonic acid and deionized water to prepare a component A by reacting a premix solution prepared by mixing the components A with potassium permanganate solution, introducing a large amount of small bubbles into machine-made sand concrete during the process of stirring the concrete, increasing the flow rate of the concrete to improve the workability of the concrete, and in addition, stirring and mixing polyvinyl alcohol, anhydrous sodium sulfate, modified beta-cyclodextrin and a defoaming agent to prepare a component B, adding the component B into the machine-made sand concrete, so as to reduce the slump of the concrete, improve the bleeding segregation phenomenon of the concrete, so as to improve the workability of the concrete, and in addition, the component B can be mutually matched with the component A, so that the fluidity and cohesiveness of the concrete are kept uniform, and the concrete can keep high cohesiveness under a large flow state, and the fluidity of the concrete is convenient to control.
Comparative example 2, with reference to the preparation procedure of example 1, the other conditions were unchanged, only step S2 was removed, and the modified cyclodextrin in step S3 was replaced with an equivalent amount of β -cyclodextrin, i.e. without modification of β -cyclodextrin, and then machine-made sand concrete was prepared according to the subsequent steps.
The prepared machine-made sand concrete was then subjected to performance test with reference to the performance test method in example 1, as shown in fig. 2, and the results showed that: the initial flow rate is about 328mm, the 1h flow rate is about 286mm, the initial slump is about 255 mm, the 1h slump is about 237mm, the expansion rate is about 640 mm, the 1h expansion rate is about 605mm, and the segregation rate is about 5.4%.
Comparing the test results of the above example 1, it is known that after the beta-cyclodextrin, sulfamic acid and N, N-dimethylformamide are mixed at high speed, the modified beta-cyclodextrin is subjected to a modification reaction under microwave irradiation, so that not only can the effect of a part of the water reducer be replaced, but also the workability of concrete can be improved, and in addition, the component B obtained by compounding the modified beta-cyclodextrin with polyvinyl alcohol, anhydrous sodium sulfate and a defoaming agent can also replace the effect of a part of the water reducer, thereby achieving the effect of saving the water reducer.
Comparative example 3, referring to the preparation procedure of example 1, other conditions were not changed, and only the step of surface-modifying the machine-made sand in step S4 was removed, and then machine-made sand concrete was prepared according to the subsequent steps.
The prepared machine-made sand concrete was then subjected to performance test with reference to the performance test method in example 1, as shown in fig. 2, and the results showed that: the initial fluidity was about 302mm, the 1h fluidity was about 243mm, the initial slump was about 227mm, the 1h slump was about 206mm, the expansion was about 553mm, the 1h expansion was about 498mm, and the segregation rate was about 4.7%.
Comparing the test results of example 1 above, it is known that, before adding the machine-made sand, the machine-made sand is first added into the ball mill after taking out the ball milling medium, so that the machine-made sand collides with each other and rubs, and the surface modification is performed, so that the grain shape of the machine-made sand can be improved, and the fluidity and cohesiveness of the machine-made sand concrete are improved, so as to further improve the workability of the machine-made sand concrete.
Comparative example 4, with reference to the preparation procedure of example 1, the other conditions were unchanged, only the guar gum in step S4 was replaced with an equivalent amount of component B, and then the machine-made sand concrete was prepared according to the subsequent procedure.
The prepared machine-made sand concrete was then subjected to performance test with reference to the performance test method in example 1, as shown in fig. 2, and the results showed that: the initial fluidity was about 322mm, the 1h fluidity was about 273mm, the initial slump was about 248mm, the 1h slump was about 231mm, the expansion was about 630mm, the 1h expansion was about 588mm, and the segregation rate was about 4.2%.
Comparing the test results of the above example 1, it is known that the water retention, suspension and wrapping properties of the machine-made sand concrete can be improved, the segregation rate can be reduced, and the guar gum can cooperate with the action of the component B to further improve the workability of the machine-made sand concrete.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (4)
1. The preparation method of the machine-made sand concrete with high workability is characterized by comprising the following steps of:
s1: adding thiourea to react to prepare the component A
Mixing methacrylic acid, acrylamide, deionized water and 2-methacrylamide-2-methylene isopropyl sulfonic acid to prepare a premix, fully mixing 4-hydroxybutyl vinyl polyoxyethylene ether and deionized water, adding thiourea, stirring and mixing, and simultaneously adding the premix and a potassium permanganate solution for reaction to obtain a component A;
s2: preparation of modified cyclodextrin by adding sulfamic acid
The beta-cyclodextrin, sulfamic acid and N, N-dimethylformamide are dispersed and mixed at high speed, then the mixture reacts under the irradiation of microwaves, and then sodium hydroxide solution is added to adjust the pH value, so as to obtain modified cyclodextrin;
s3: adding modified cyclodextrin to prepare component B
Stirring and mixing polyvinyl alcohol, anhydrous sodium sulfate and the modified cyclodextrin, adding a defoaming agent, and continuously stirring and mixing uniformly to obtain a component B;
s4: adding component A, component B and guar gum, and mixing thoroughly
Fully stirring and mixing cement, fly ash, modified machine-made sand and crushed stone, adding a water reducing agent and water, stirring and mixing, and mixing the component A, the component B and guar gum to obtain machine-made sand concrete;
the step S1 of adding thiourea for reaction to prepare the component A comprises the following steps:
s1.1: adding methacrylic acid, acrylamide and deionized water into a mixing tank according to the mass ratio of 10-12:3-4:6-8, fully stirring and mixing, then adding 2-methacrylamide-2-methyleneisopropyl sulfonic acid, and continuously stirring and mixing to obtain a premix for later use;
s1.2: fully dissolving and mixing potassium permanganate and deionized water according to a solid-to-liquid ratio of 1g to 20-30mL to obtain a potassium permanganate solution for later use;
s1.3: adding 4-hydroxybutyl vinyl polyoxyethylene ether and deionized water into a reactor according to a mass ratio of 4-6:1, stirring for 20-30min at a speed of 300-400r/min by using a stirrer, and fully dissolving;
s1.4: adding thiourea into the reactor, regulating the stirring speed to 200-300r/min by a stirrer, and continuously stirring for 30-40min;
s1.5: the stirring speed is kept unchanged, the premixed solution and the potassium permanganate solution are added into a reactor at a constant speed, the reaction is carried out while stirring, and the reaction is continued for 1-2h after the addition is completed;
s1.6: adding sodium hydroxide solution into the reactor until the pH value is detected to be 7-8 by a pH detector in the reactor, and stopping adding the sodium hydroxide solution to obtain a component A;
the step S2 of adding sulfamic acid to prepare modified cyclodextrin specifically comprises the following steps:
s2.1: adding beta-cyclodextrin, sulfamic acid and N, N-dimethylformamide together according to the mass ratio of 10-12:1:15-20 into a closed high-speed dispersing machine, stirring at a high speed of 2800-3000r/min for 20-30min, and uniformly dispersing to obtain an intermediate I;
s2.2: placing the intermediate I in a microwave reactor, irradiating for 6-10min with 200-300W power, and reacting to obtain an intermediate II;
s2.3: adding sodium hydroxide solution into the intermediate II, stirring and dispersing until the pH value of the intermediate II is regulated to 6-7, and stopping adding the sodium hydroxide solution to obtain modified cyclodextrin;
the step S3 of adding modified cyclodextrin to prepare the component B comprises the following steps:
s3.1: adding polyvinyl alcohol, anhydrous sodium sulfate and the modified cyclodextrin prepared in the step S2.3 into a stirrer together according to the mass ratio of 3-5:2-4:3-4 until a second gravity sensor in the stirrer detects that the gravity in the stirrer is not increased any more, and sending a signal to a controller by the second gravity sensor;
s3.2: after the controller receives the signal sent by the second gravity sensor, the stirrer is controlled to stir for 1-2h at the speed of 300-500 r/min;
s3.3: the controller controls the feeding component to add the defoaming agent into the stirrer according to 25-35% of the mass of the polyvinyl alcohol until the second gravity sensor detects that the gravity in the stirrer is not increased again, and the second gravity sensor sends a signal to the controller again;
s3.4: after the controller receives the signal sent by the second gravity sensor again, controlling the stirrer to stir at the speed of 800-1000r/min for 40-50min to obtain a component B;
the step S4 of adding the component A, the component B and the guar gum and fully mixing comprises the following steps:
s4.1: adding cement, fly ash, modified machine-made sand and crushed stone into a concrete mixer, starting the concrete mixer, stirring for 20-30min, and fully dispersing and mixing;
s4.2: adding the water reducer and water into a concrete mixer, continuously stirring for 10-20min, and fully mixing to obtain a component C;
s4.3: adding the component B and guar gum prepared in the step S3.4 into a concrete mixer, and fully mixing with the component C;
s4.4: adding the component A prepared in the step S1.7 into a concrete mixer, and continuously stirring and mixing to obtain machine-made sand concrete;
before machine-made sand is added to prepare machine-made sand concrete, the machine-made sand is subjected to modification pretreatment: taking out all ball milling media in the ball mill, putting machine-made sand in the ball mill, starting the ball mill, performing throwing motion on the machine-made sand in the ball mill, performing mutual collision friction on the machine-made sand through the throwing motion, and performing surface modification;
the machine-made sand concrete comprises: 300-400 parts of cement, 200-300 parts of fly ash, 650-750 parts of machine-made sand, 500-600 parts of crushed stone, 20-30 parts of component A, 25-35 parts of component B, 12-18 parts of guar gum, 4-6 parts of water reducer and 160-200 parts of water.
2. The method for preparing high-workability machine-made sand concrete according to claim 1, wherein the mass ratio of 2-methacrylamide-2-methyleneisopropyl sulfonic acid to methacrylic acid is 2-3:1.
3. The preparation method of the high-workability machine-made sand concrete according to claim 1, wherein the mass ratio of the 4-hydroxybutyl vinyl polyoxyethylene ether to the thiourea to the premix solution to the potassium permanganate solution is 1:2-3:5-7:3-5.
4. A high workability machine-made sand concrete characterized in that it is prepared by a method for preparing a high workability machine-made sand concrete as claimed in any one of claims 1 to 3.
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